System for the transmission of writing and the like in facsimile.



H. F088 6: H. PETERSEN. SYSTEM FOR THE TRANSMISSION OF WRITING AND THELIKE IN FACSIMILE. APPLICATION FILED MAY 8. 1911.

1,290,957. Patented Jan. 14,1919.

UNITED STATES PATENT OFFICE.

HERMAN FOSS, OF TJ'6M6, AND HERMOD PETERSEN, OF CHRISTIANIA, NORWAY-SYSTEM FOR THE TRANSMISSION OF WRITING AND THE LIKE IN FACSIMILE.

Specification of Letters Patent. I Patented an. 14, 1919,

Application filed May 8, 1917. Serial No. 187,353.

To all whom it may concern:

Be it known that we, HERMAN Foss and HERMOD PETERSEN, both subjects ofthe King of Norway, and residing at Tjomo, Norway, and Christiania,Norway, respectively, have invented certain new and useful Improvementsin'Systems for the Transmission of Writing and the like in Facsimile;and they do hereby declare the following to be a full, clear; and exactdescription of the invention, such as will enable others skilled,

. transmission of writing in facsimile, in which the writing is effectedat the recelvmg station by means of electric sparks perforating paper orthe like consists in the production of sufficiently strong impulses ofelectric current to effect the necessary sparks when transmission is totake place over long distances.

According to the present invention this difficulty is overcome by alwayshaving the source of current feeding the transmission wires connectedtothe latter and to the re-- ceiving apparatus, while the sendingapparatus is so constructed that it short-circuits part of the energytransmitted from the source of current except at the moments when animpulse of current is to be transmitted. l

The energy delivered by the source of current at the same time is soadjusted that when part of the same is short-circuited at the sendingstation it is just insuflicient to produce sparks at the receivingstation, while as soon the short-circuit is cut off for one moment sothat it may work at full tension, it is sufficiently strong to producethe necessary sparks. I

The short-circuiting of the necessary branch of the transmission wiresat the sending station may be carried out in a known manner by means ofa contact pin passing over a cylinder 01" the like provided with.writing or illustrations ininsulating ink, so

that the short-circuit is cut off each time the pin passes part of thewriting.

It has been found advisable to place a source of current, preferably ahigh fre- I quency generator producing the current impulses for thereceiving station, at the said station, the short-circuiting of thecurrent taking place through the transmission wires. Although only acomparatively small part of'the total energy of the source of current'is taken up by the short-circuit, the apparatus of the receiving stationmay always be so adjusted, that the current impulses, when theshort-circuit is cut in, are just too weak to roduce sparks, while thenecessary spar s are produced at once as soon as the short circuit atthe sending station is cut oil.

On the drawing a form of the invention is illustrated diagrammatically.

1 is a rotating metal cylinder at the sending station and 2 isthe-contact pin resting on the same, said contact pin being pivoted at3. The cylinder 1 and contact pin 2 are connected by means oftransmission wires 4. to the brushes 5, 6 of a high-frequency enerator 7i at the receiving station. aid

brushes 5, 6 are also connected to roller 8 80.

and sparking pin 9 of the receiving station, roller 8 rotatingsynchronous with roller 1.

Pin 9 is maintained a short distance from roller 8 .so that sparks passbetween the same when exposed to the full current of the generator. Whenhowever the contact between 2 and 1 is established part of the generatorcurrent goes through the trans mission wire 4, and the current is notstrong enough to produce sparks at 9. When roller 1 is provided withinsulating writing or the like, the current will be interrupted eachtime pin 2 passes over part of the writing and at these moments thecurrent from generator 7 will be sufficiently strong to produce.'sparks' at 9 perforating a paper placed on cylinder 8. The manner inwhich synchromsm is maintamed between rollers 1 and 8 does not form partof our invention. It

may be accomplished in any Well known 10!,

manner, for example, by like clock mechanisms at the respectivestations.

We claim: p 1. In a system for the transmission of facsimile signals, ahigh frequency generator 1 5 at therreceiving station andshort-circuited at thesending station, a sparking-device at thereceiving station for perforating a sheet of paper when an impulse isreceived from the sending station, said sparking .device receiving itscurrent from the high frequency generator, means at the sending Sta tionto interrupt short-circuiting of the said generator when an impulse isto be transmitted, the energy of the generator being just sufficient toproduce sparks at the receiving station at the moments when theshort-circuiting at the sending station is interrupted.

2. In a system for the transmission of facsimile signals, a highfrequency generator at the receiving station and short-circuited at thesending station, a sparking device at the receiving station forperforating a sheet of paper when an impulse is received from thesending station, said sparking-device receiving its current from thehigh frequency generator, means at the sending station comprising arotating roller' of conductive material covered by writing in insulatingink and a contact pin resting on the said roller for interrupting theshort.- circuiting each time the contact pin passes over part of thewriting.

3. In a system for the transmission of facsimile signals, a sendingstation comprising means actuated by the writing for 1n- ,terrupting anelectric current, a receiving perforating paper by means of electricsparks at the receiving station said sparking device being connected tothe source of cure rent and being so adjusted that it will producesparks only at the moments when the current at the sending station isinterrupted thereby strengthening the tension of the current at thereceiving station.

In testimony that we claim the foregoing as our invention, We havesigned our names in presence of two subscribing witnesses.

HERMAN FOSS. HERMOD PETERSEN.

Witnesses: I

C. FABRIGIUS HANSEN, O. NORMAN.

